These balloons can be inflated with air or helium. If you inflate the balloon with air, it will not float! If you inflate the balloon with helium it will float for a few hours.
The balloons wil come flat

These balloons can be inflated with air or helium. If you inflate the balloon with air, it will not float! If you inflate the balloon with helium it will float for a few hours.
The balloons wil come flat